I failed this run miserably on Monday, it seems I wasn't very well so it set me back a few days. I didn't want to attempt it again while feeling poorly but this morning I felt 100% so gave it a go, fully expecting not to manage it. Well, I did it and it felt great I covered 4km which is the furthest I've managed so far just by increasing my speed slightly (i do it on a treadmill).
Confidence back now and looking forward to R2 and R3.